In this pic (above) that was just taken a couple days ago, we can't believe how huge he's grown in the past couple of years! Guess when you're the offspring of the "Austrian Oak," this is how big you grow!

The former Mr. Universe bought a complete home gym for his very similar sized son! And, now, with a gym in tow Joseph may soon become a Mr. Universe, too! Just like his old man!

The not-so-secret son, who Arnold announced was definitely his about two years ago, not only has his father's body but also looks quite a lot like him, too!

Joseph lives with his mom Mildred in the city of Bakersfield in California, but has established a relationship with his dad. They have a lot of chats on the phone, and Arnold has even taken him on several trips.

But now, that's all about to change, at least according to TMZ! That's because a week from tomorrow -- on December 17 -- Khloé and Lamar's split will be legal, final, and FULL! And that's all she wrote!

As the final divorce docs are set to be stamped by a judge on that day just over a week from right now, the final terms are pretty standard and straightforward, too: